7 1/4 sure-grip?

Anyone know where to get parts for this rear? It's a 7 1/4 sure-grip. Also has anyone rebuilt this rear and is there any write ups on it. I believe the clutches need to be replaced. I haven't looked at it yet, but seems that's the issue. I have slipping going on and a what sounds like a metallic noise when I power brake it. Doesn't sound very good back there. :( Or the PO put in the wrong gear oil. I need to pull the cover and inspect it.
Thank you...